<template>
  <form-item-wrapper :designer="designer" :field="field" :rules="rules" :design-state="designState"
                     :parent-widget="parentWidget" :parent-list="parentList" :index-of-parent-list="indexOfParentList"
                     :sub-form-row-index="subFormRowIndex" :sub-form-col-index="subFormColIndex"
                     :sub-form-row-id="subFormRowId"
                     :in-table-flag="inTableFlag"
                     :column-prop="columnProp"
  >
    <el-input type="textarea" ref="fieldEditor" v-model="fieldModel" v-show="!isReadMode"
              :disabled="field.options.disabled" :readonly="field.options.readonly"
              :placeholder="field.options.placeholder" :rows="field.options.rows"
              :key="textareaKey" :autosize="field.options.autosize"
              :minlength="field.options.minLength" :maxlength="field.options.maxLength"
              :show-word-limit="field.options.showWordLimit"
              @focus="handleFocusCustomEvent" @blur="handleBlurCustomEvent" @input="handleInputCustomEvent"
              @change="handleChangeEvent">
    </el-input>
    <template v-if="isReadMode">
      <div v-html="contentForReadMode" class="readonly-mode-field"></div>
    </template>
  </form-item-wrapper>
</template>

<script>
import FormItemWrapper from './form-item-wrapper'
import {generateId} from "@/utils/util"
import emitter from '@/utils/emitter'
import i18n, {translate} from "@/utils/i18n";
import fieldMixin from "@/components/form-designer/form-widget/field-widget/fieldMixin";

export default {
  name: "textarea-widget",
  componentName: 'FieldWidget',  //必须固定为FieldWidget，用于接收父级组件的broadcast事件
  mixins: [emitter, fieldMixin, i18n],
  props: {
    field: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    designState: {
      type: Boolean,
      default: false
    },

    subFormRowIndex: { /* 子表单组件行索引，从0开始计数 */
      type: Number,
      default: -1
    },
    subFormColIndex: { /* 子表单组件列索引，从0开始计数 */
      type: Number,
      default: -1
    },
    subFormRowId: { /* 子表单组件行Id，唯一id且不可变 */
      type: String,
      default: ''
    },

  },
  components: {
    FormItemWrapper,
  },
  data() {
    return {
      oldFieldValue: null, //field组件change之前的值
      fieldModel: null,
      rules: [],
      widgetKey: '',
    }
  },
  computed: {
    textareaKey() {
      return this.widgetKey || this.field.id
    },

    contentForReadMode() {
      return this.fieldModel ? this.fieldModel : '--'
    }

  },
  beforeCreate() {
    /* 这里不能访问方法和属性！！ */
  },

  created() {
    /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
       需要在父组件created中初始化！！ */
    this.registerToRefList()
    this.initFieldModel()
    this.initEventHandler()
    this.buildFieldRules()

    this.handleOnCreated()
  },

  mounted() {
    this.handleOnMounted()
  },

  beforeUnmount() {
    this.unregisterFromRefList()
  },

  methods: {
    refreshWidgetKey() {  //强制刷新组件！！
      this.widgetKey = 'textarea-key-' + generateId()
    },

  }
}
</script>

<style lang="scss" scoped>
 /* form-item-wrapper已引入，还需要重复引入吗？ */

.readonly-mode-field {
  display: inline-block;
  white-space: pre-wrap;
  line-height: 1.5;
  min-height: 32px;
}
</style>
